lec.c

linux 内核源代码

		if (mesg->content.normal.no_source_le_narp)
			break;
		/* FALL THROUGH */
	case l_arp_update:
		lec_arp_update(priv, mesg->content.normal.mac_addr,
			       mesg->content.normal.atm_addr,
			       mesg->content.normal.flag,
			       mesg->content.normal.targetless_le_arp);
		pr_debug("lec: in l_arp_update\n");
		if (mesg->sizeoftlvs != 0) {	/* LANE2 3.1.5 */
			pr_debug("lec: LANE2 3.1.5, got tlvs, size %d\n",
				mesg->sizeoftlvs);
			lane2_associate_ind(dev, mesg->content.normal.mac_addr,
					    tmp, mesg->sizeoftlvs);
		}
		break;
	case l_config:
		priv->maximum_unknown_frame_count =
		    mesg->content.config.maximum_unknown_frame_count;
		priv->max_unknown_frame_time =
		    (mesg->content.config.max_unknown_frame_time * HZ);
		priv->max_retry_count = mesg->content.config.max_retry_count;
		priv->aging_time = (mesg->content.config.aging_time * HZ);
		priv->forward_delay_time =
		    (mesg->content.config.forward_delay_time * HZ);
		priv->arp_response_time =
		    (mesg->content.config.arp_response_time * HZ);
		priv->flush_timeout = (mesg->content.config.flush_timeout * HZ);
		priv->path_switching_delay =
		    (mesg->content.config.path_switching_delay * HZ);
		priv->lane_version = mesg->content.config.lane_version;	/* LANE2 */
		priv->lane2_ops = NULL;
		if (priv->lane_version > 1)
			priv->lane2_ops = &lane2_ops;
		if (dev->change_mtu(dev, mesg->content.config.mtu))
			printk("%s: change_mtu to %d failed\n", dev->name,
			       mesg->content.config.mtu);
		priv->is_proxy = mesg->content.config.is_proxy;
		break;
	case l_flush_tran_id:
		lec_set_flush_tran_id(priv, mesg->content.normal.atm_addr,
				      mesg->content.normal.flag);
		break;
	case l_set_lecid:
		priv->lecid =
		    (unsigned short)(0xffff & mesg->content.normal.flag);
		break;
	case l_should_bridge:
#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
		{
			struct net_bridge_fdb_entry *f;

			pr_debug
			    ("%s: bridge zeppelin asks about %s\n",
			     dev->name,
			     print_mac(mac, mesg->content.proxy.mac_addr));

			if (br_fdb_get_hook == NULL || dev->br_port == NULL)
				break;

			f = br_fdb_get_hook(dev->br_port->br,
					    mesg->content.proxy.mac_addr);
			if (f != NULL && f->dst->dev != dev
			    && f->dst->state == BR_STATE_FORWARDING) {
				/* hit from bridge table, send LE_ARP_RESPONSE */
				struct sk_buff *skb2;
				struct sock *sk;

				pr_debug
				    ("%s: entry found, responding to zeppelin\n",
				     dev->name);
				skb2 =
				    alloc_skb(sizeof(struct atmlec_msg),
					      GFP_ATOMIC);
				if (skb2 == NULL) {
					br_fdb_put_hook(f);
					break;
				}
				skb2->len = sizeof(struct atmlec_msg);
				skb_copy_to_linear_data(skb2, mesg,
							sizeof(*mesg));
				atm_force_charge(priv->lecd, skb2->truesize);
				sk = sk_atm(priv->lecd);
				skb_queue_tail(&sk->sk_receive_queue, skb2);
				sk->sk_data_ready(sk, skb2->len);
			}
			if (f != NULL)
				br_fdb_put_hook(f);
		}
#endif /* defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) */
		break;
	default:
		printk("%s: Unknown message type %d\n", dev->name, mesg->type);
		dev_kfree_skb(skb);
		return -EINVAL;
	}
	dev_kfree_skb(skb);
	return 0;
}

static void lec_atm_close(struct atm_vcc *vcc)
{
	struct sk_buff *skb;
	struct net_device *dev = (struct net_device *)vcc->proto_data;
	struct lec_priv *priv = (struct lec_priv *)dev->priv;

	priv->lecd = NULL;
	/* Do something needful? */

	netif_stop_queue(dev);
	lec_arp_destroy(priv);

	if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
		printk("%s lec_atm_close: closing with messages pending\n",
		       dev->name);
	while ((skb = skb_dequeue(&sk_atm(vcc)->sk_receive_queue)) != NULL) {
		atm_return(vcc, skb->truesize);
		dev_kfree_skb(skb);
	}

	printk("%s: Shut down!\n", dev->name);
	module_put(THIS_MODULE);
}

static struct atmdev_ops lecdev_ops = {
	.close = lec_atm_close,
	.send = lec_atm_send
};

static struct atm_dev lecatm_dev = {
	.ops = &lecdev_ops,
	.type = "lec",
	.number = 999,		/* dummy device number */
	.lock = __SPIN_LOCK_UNLOCKED(lecatm_dev.lock)
};

/*
 * LANE2: new argument struct sk_buff *data contains
 * the LE_ARP based TLVs introduced in the LANE2 spec
 */
static int
send_to_lecd(struct lec_priv *priv, atmlec_msg_type type,
	     unsigned char *mac_addr, unsigned char *atm_addr,
	     struct sk_buff *data)
{
	struct sock *sk;
	struct sk_buff *skb;
	struct atmlec_msg *mesg;

	if (!priv || !priv->lecd) {
		return -1;
	}
	skb = alloc_skb(sizeof(struct atmlec_msg), GFP_ATOMIC);
	if (!skb)
		return -1;
	skb->len = sizeof(struct atmlec_msg);
	mesg = (struct atmlec_msg *)skb->data;
	memset(mesg, 0, sizeof(struct atmlec_msg));
	mesg->type = type;
	if (data != NULL)
		mesg->sizeoftlvs = data->len;
	if (mac_addr)
		memcpy(&mesg->content.normal.mac_addr, mac_addr, ETH_ALEN);
	else
		mesg->content.normal.targetless_le_arp = 1;
	if (atm_addr)
		memcpy(&mesg->content.normal.atm_addr, atm_addr, ATM_ESA_LEN);

	atm_force_charge(priv->lecd, skb->truesize);
	sk = sk_atm(priv->lecd);
	skb_queue_tail(&sk->sk_receive_queue, skb);
	sk->sk_data_ready(sk, skb->len);

	if (data != NULL) {
		pr_debug("lec: about to send %d bytes of data\n", data->len);
		atm_force_charge(priv->lecd, data->truesize);
		skb_queue_tail(&sk->sk_receive_queue, data);
		sk->sk_data_ready(sk, skb->len);
	}

	return 0;
}

/* shamelessly stolen from drivers/net/net_init.c */
static int lec_change_mtu(struct net_device *dev, int new_mtu)
{
	if ((new_mtu < 68) || (new_mtu > 18190))
		return -EINVAL;
	dev->mtu = new_mtu;
	return 0;
}

static void lec_set_multicast_list(struct net_device *dev)
{
	/*
	 * by default, all multicast frames arrive over the bus.
	 * eventually support selective multicast service
	 */
	return;
}

static void lec_init(struct net_device *dev)
{
	dev->change_mtu = lec_change_mtu;
	dev->open = lec_open;
	dev->stop = lec_close;
	dev->hard_start_xmit = lec_start_xmit;
	dev->tx_timeout = lec_tx_timeout;

	dev->get_stats = lec_get_stats;
	dev->set_multicast_list = lec_set_multicast_list;
	dev->do_ioctl = NULL;
	printk("%s: Initialized!\n", dev->name);
	return;
}

static unsigned char lec_ctrl_magic[] = {
	0xff,
	0x00,
	0x01,
	0x01
};

#define LEC_DATA_DIRECT_8023  2
#define LEC_DATA_DIRECT_8025  3

static int lec_is_data_direct(struct atm_vcc *vcc)
{
	return ((vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8023) ||
		(vcc->sap.blli[0].l3.tr9577.snap[4] == LEC_DATA_DIRECT_8025));
}

static void lec_push(struct atm_vcc *vcc, struct sk_buff *skb)
{
	unsigned long flags;
	struct net_device *dev = (struct net_device *)vcc->proto_data;
	struct lec_priv *priv = (struct lec_priv *)dev->priv;

#if DUMP_PACKETS >0
	int i = 0;
	char buf[300];

	printk("%s: lec_push vcc vpi:%d vci:%d\n", dev->name,
	       vcc->vpi, vcc->vci);
#endif
	if (!skb) {
		pr_debug("%s: null skb\n", dev->name);
		lec_vcc_close(priv, vcc);
		return;
	}
#if DUMP_PACKETS > 0
	printk("%s: rcv datalen:%ld lecid:%4.4x\n", dev->name,
	       skb->len, priv->lecid);
#if DUMP_PACKETS >= 2
	for (i = 0; i < skb->len && i < 99; i++) {
		sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
	}
#elif DUMP_PACKETS >= 1
	for (i = 0; i < skb->len && i < 30; i++) {
		sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
	}
#endif /* DUMP_PACKETS >= 1 */
	if (i == skb->len)
		printk("%s\n", buf);
	else
		printk("%s...\n", buf);
#endif /* DUMP_PACKETS > 0 */
	if (memcmp(skb->data, lec_ctrl_magic, 4) == 0) {	/* Control frame, to daemon */
		struct sock *sk = sk_atm(vcc);

		pr_debug("%s: To daemon\n", dev->name);
		skb_queue_tail(&sk->sk_receive_queue, skb);
		sk->sk_data_ready(sk, skb->len);
	} else {		/* Data frame, queue to protocol handlers */
		struct lec_arp_table *entry;
		unsigned char *src, *dst;

		atm_return(vcc, skb->truesize);
		if (*(__be16 *) skb->data == htons(priv->lecid) ||
		    !priv->lecd || !(dev->flags & IFF_UP)) {
			/*
			 * Probably looping back, or if lecd is missing,
			 * lecd has gone down
			 */
			pr_debug("Ignoring frame...\n");
			dev_kfree_skb(skb);
			return;
		}
#ifdef CONFIG_TR
		if (priv->is_trdev)
			dst = ((struct lecdatahdr_8025 *)skb->data)->h_dest;
		else
#endif
			dst = ((struct lecdatahdr_8023 *)skb->data)->h_dest;

		/*
		 * If this is a Data Direct VCC, and the VCC does not match
		 * the LE_ARP cache entry, delete the LE_ARP cache entry.
		 */
		spin_lock_irqsave(&priv->lec_arp_lock, flags);
		if (lec_is_data_direct(vcc)) {
#ifdef CONFIG_TR
			if (priv->is_trdev)
				src =
				    ((struct lecdatahdr_8025 *)skb->data)->
				    h_source;
			else
#endif
				src =
				    ((struct lecdatahdr_8023 *)skb->data)->
				    h_source;
			entry = lec_arp_find(priv, src);
			if (entry && entry->vcc != vcc) {
				lec_arp_remove(priv, entry);
				lec_arp_put(entry);
			}
		}
		spin_unlock_irqrestore(&priv->lec_arp_lock, flags);

		if (!(dst[0] & 0x01) &&	/* Never filter Multi/Broadcast */
		    !priv->is_proxy &&	/* Proxy wants all the packets */
		    memcmp(dst, dev->dev_addr, dev->addr_len)) {
			dev_kfree_skb(skb);
			return;
		}
		if (!hlist_empty(&priv->lec_arp_empty_ones)) {
			lec_arp_check_empties(priv, vcc, skb);
		}
		skb_pull(skb, 2);	/* skip lec_id */
#ifdef CONFIG_TR
		if (priv->is_trdev)
			skb->protocol = tr_type_trans(skb, dev);
		else
#endif
			skb->protocol = eth_type_trans(skb, dev);
		priv->stats.rx_packets++;
		priv->stats.rx_bytes += skb->len;
		memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
		netif_rx(skb);
	}
}

static void lec_pop(struct atm_vcc *vcc, struct sk_buff *skb)
{
	struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc);
	struct net_device *dev = skb->dev;

	if (vpriv == NULL) {
		printk("lec_pop(): vpriv = NULL!?!?!?\n");
		return;
	}

	vpriv->old_pop(vcc, skb);

	if (vpriv->xoff && atm_may_send(vcc, 0)) {
		vpriv->xoff = 0;
		if (netif_running(dev) && netif_queue_stopped(dev))
			netif_wake_queue(dev);
	}
}

static int lec_vcc_attach(struct atm_vcc *vcc, void __user *arg)
{
	struct lec_vcc_priv *vpriv;
	int bytes_left;
	struct atmlec_ioc ioc_data;

	/* Lecd must be up in this case */
	bytes_left = copy_from_user(&ioc_data, arg, sizeof(struct atmlec_ioc));
	if (bytes_left != 0) {
		printk
		    ("lec: lec_vcc_attach, copy from user failed for %d bytes\n",
		     bytes_left);
	}
	if (ioc_data.dev_num < 0 || ioc_data.dev_num >= MAX_LEC_ITF ||
	    !dev_lec[ioc_data.dev_num])
		return -EINVAL;
	if (!(vpriv = kmalloc(sizeof(struct lec_vcc_priv), GFP_KERNEL)))
		return -ENOMEM;
	vpriv->xoff = 0;
	vpriv->old_pop = vcc->pop;
	vcc->user_back = vpriv;
	vcc->pop = lec_pop;
	lec_vcc_added(dev_lec[ioc_data.dev_num]->priv,
		      &ioc_data, vcc, vcc->push);
	vcc->proto_data = dev_lec[ioc_data.dev_num];
	vcc->push = lec_push;
	return 0;
}

static int lec_mcast_attach(struct atm_vcc *vcc, int arg)
{
	if (arg < 0 || arg >= MAX_LEC_ITF || !dev_lec[arg])
		return -EINVAL;
	vcc->proto_data = dev_lec[arg];
	return (lec_mcast_make((struct lec_priv *)dev_lec[arg]->priv, vcc));
}

/* Initialize device. */
static int lecd_attach(struct atm_vcc *vcc, int arg)
{
	int i;
	struct lec_priv *priv;

	if (arg < 0)
		i = 0;
	else
		i = arg;
#ifdef CONFIG_TR
	if (arg >= MAX_LEC_ITF)
		return -EINVAL;
#else				/* Reserve the top NUM_TR_DEVS for TR */
	if (arg >= (MAX_LEC_ITF - NUM_TR_DEVS))
		return -EINVAL;
#endif
	if (!dev_lec[i]) {
		int is_trdev, size;

		is_trdev = 0;
		if (i >= (MAX_LEC_ITF - NUM_TR_DEVS))
			is_trdev = 1;

		size = sizeof(struct lec_priv);
#ifdef CONFIG_TR
		if (is_trdev)
			dev_lec[i] = alloc_trdev(size);
		else
#endif
			dev_lec[i] = alloc_etherdev(size);
		if (!dev_lec[i])
			return -ENOMEM;
		snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
		if (register_netdev(dev_lec[i])) {
			free_netdev(dev_lec[i]);
			return -EINVAL;
		}

		priv = dev_lec[i]->priv;
		priv->is_trdev = is_trdev;
		lec_init(dev_lec[i]);
	} else {
		priv = dev_lec[i]->priv;
		if (priv->lecd)
			return -EADDRINUSE;
	}
	lec_arp_init(priv);
	priv->itfnum = i;	/* LANE2 addition */
	priv->lecd = vcc;
	vcc->dev = &lecatm_dev;
	vcc_insert_socket(sk_atm(vcc));

	vcc->proto_data = dev_lec[i];
	set_bit(ATM_VF_META, &vcc->flags);
	set_bit(ATM_VF_READY, &vcc->flags);

	/* Set default values to these variables */
	priv->maximum_unknown_frame_count = 1;
	priv->max_unknown_frame_time = (1 * HZ);
	priv->vcc_timeout_period = (1200 * HZ);
	priv->max_retry_count = 1;
	priv->aging_time = (300 * HZ);
	priv->forward_delay_time = (15 * HZ);
	priv->topology_change = 0;
	priv->arp_response_time = (1 * HZ);
	priv->flush_timeout = (4 * HZ);
	priv->path_switching_delay = (6 * HZ);

	if (dev_lec[i]->flags & IFF_UP) {
		netif_start_queue(dev_lec[i]);
	}
	__module_get(THIS_MODULE);
	return i;
}

#ifdef CONFIG_PROC_FS
static char *lec_arp_get_status_string(unsigned char status)
{
	static char *lec_arp_status_string[] = {
		"ESI_UNKNOWN       ",
		"ESI_ARP_PENDING   ",
		"ESI_VC_PENDING    ",
		"<Undefined>       ",
		"ESI_FLUSH_PENDING ",